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What schedule pipe for an equalizer

I have a Weil McLain LGB-6 steam boiler. A section of pipe and a fitting on the equalizer are rusting on the outside to the effect of a leak. What schedule pipe should be used? The boiler was installed around 1997. I run it at 4 oz. cut-in and 10 oz cut-out with a Vaporstat, but I assume that's not relevant to this pipe issue.